package com.baidu.ueditor.upload;

import com.baidu.ueditor.PathFormat;
import com.baidu.ueditor.define.AppInfo;
import com.baidu.ueditor.define.BaseState;
import com.baidu.ueditor.define.FileType;
import com.baidu.ueditor.define.State;

import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class BinaryUploader{

    public static final State save(HttpServletRequest request, Map<String, Object> conf){
        FileItemStream fileStream = null;
        boolean isAjaxUpload = request.getHeader("X_Requested_With") != null;

        if(!ServletFileUpload.isMultipartContent(request)){
            return new BaseState(false, AppInfo.NOT_MULTIPART_CONTENT);
        }

        ServletFileUpload upload = new ServletFileUpload(new DiskFileItemFactory());

        if(isAjaxUpload){
            upload.setHeaderEncoding("UTF-8");
        }

        try{
            FileItemIterator iterator = upload.getItemIterator(request);

            while(iterator.hasNext()){
                fileStream = iterator.next();

                if(!fileStream.isFormField())
                    break;
                fileStream = null;
            }

            if(fileStream == null){
                return new BaseState(false, AppInfo.NOTFOUND_UPLOAD_DATA);
            }

            String savePath = (String) conf.get("savePath");
            String originFileName = fileStream.getName();
            String suffix = FileType.getSuffixByFilename(originFileName);

            originFileName = originFileName.substring(0, originFileName.length() - suffix.length());
            savePath = savePath + suffix;

            long maxSize = ((Long) conf.get("maxSize")).longValue();

            if(!validType(suffix, (String[]) conf.get("allowFiles"))){
                return new BaseState(false, AppInfo.NOT_ALLOW_FILE_TYPE);
            }

            savePath = PathFormat.parse(savePath, originFileName);

            String physicalPath = (String) conf.get("rootPath") + savePath;

            InputStream is = fileStream.openStream();
            State storageState = StorageManager.saveFileByInputStream(is, physicalPath, maxSize);
            is.close();

            if(storageState.isSuccess()){
                storageState.putInfo("url", PathFormat.format(savePath));
                storageState.putInfo("type", suffix);
                storageState.putInfo("original", originFileName + suffix);
            }

            return storageState;
        }catch(FileUploadException e){
            return new BaseState(false, AppInfo.PARSE_REQUEST_ERROR);
        }catch(IOException e){}
        return new BaseState(false, AppInfo.IO_ERROR);
    }

    private static boolean validType(String type, String[] allowTypes){
        List<String> list = Arrays.asList(allowTypes);

        return list.contains(type);
    }
}
